read_seqlock

函数名称：A locking reader exclusively locks out other writers and locking readers,* but doesn't update the sequence number. Acts like a normal spin_lock/unlock.* Don't need preempt_disable() because that is in the spin_lock already.

函数原型：static inline void read_seqlock_excl(seqlock_t *sl)

返回类型：void

参数：

类型	参数	名称
seqlock_t *	sl

**调用者**
名称	描述
follow_up	llow_up - Find the mountpoint of path's vfsmount* Given a path, find the mountpoint of its source file system
path_has_submounts	path_has_submounts - check for mounts over a dentry in the* current namespace.@parent: path to check. Return true if the parent or its subdirectories contain* a mount point in the current namespace.
get_mountpoint
attach_recursive_mnt	@source_mnt : mount tree to be attached@nd : place the mount tree @source_mnt is attached@parent_nd : if non-null, detach the source_mnt from its parent and* store the parent mount and mountpoint dentry
unlock_mount
path_is_under
propagate_one
propagate_mnt	mount 'source_mnt' under the destination 'dest_mnt' at* dentry 'dest_dentry'. And propagate that mount to* all the peer and slave mounts of 'dest_mnt'.* Link all the new mounts into a propagation tree headed at* source_mnt
read_seqbegin_or_lock	ad_seqbegin_or_lock - begin a sequence number check or locking block@lock: sequence lock@seq : sequence number to be checked* First try it once optimistically without taking the lock. If that fails,* take the lock

函数逻辑报告